4 research outputs found
Composition of Sedimentary Organic Matter across the Laptev Sea Shelf: Evidences from Rock-Eval Parameters and Molecular Indicators
Global warming in high latitudes causes destabilization of vulnerable permafrost deposits followed by massive thaw-release of organic carbon. Permafrost-derived carbon may be buried in the nearshore sediments, transported towards the deeper basins or degraded into the greenhouse gases, potentially initiating a positive feedback to climate change. In the present study, we aim to identify the sources, distribution and degradation state of organic matter (OM) stored in the surface sediments of the Laptev Sea (LS), which receives a large input of terrestrial carbon from both Lena River discharge and intense coastal erosion. We applied a suite of geochemical indicators including the Rock Eval parameters, traditionally used for the matured OM characterization, and terrestrial lipid biomarkers. In addition, we analyzed a comprehensive grain size data in order to assess hydrodynamic sedimentation regime across the LS shelf. Rock-Eval (RE) data characterize LS sedimentary OM with generally low hydrogen index (100β200 mg HC/g TOC) and oxygen index (200 and 300 CO2/g TOC) both increasing off to the continental slope. According to Tpeak values, there is a clear regional distinction between two groups (369β401 Β°C for the inner and mid shelf; 451β464 Β°C for the outer shelf). We suggest that permafrost-derived OM is traced across the shallow and mid depths with high Tpeak and slightly elevated HI values if compared to other Arctic continental margins. Molecular-based degradation indicators show a trend to more degraded terrestrial OC with increasing distance from the coast corroborating with RE results. However, we observed much less variation of the degradation markers down to the deeper sampling horizons, which supports the notion that the most active OM degradation in LS land-shelf system takes part during the cross-shelf transport, not while getting buried deeper
Identifying sources of organic carbon in surface sediments of Laptev Sea shelf using a Rock-Eval approach
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½Π° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡΡ Π²ΡΠ΅ΡΡΠΎΡΠΎΠ½Π½Π΅Π³ΠΎ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ², ΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΡΡ
Π·Π° ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π±ΠΈΠΎΠ³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅ΠΆΠΈΠΌΠ° Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ΅Π³ΠΈΠΎΠ½Π°. Π£Π²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΡΠ΅ΠΌΠΏΠΎΠ² Π΄Π΅Π³ΡΠ°Π΄Π°ΡΠΈΠΈ ΠΏΡΠΈΠ±ΡΠ΅ΠΆΠ½ΠΎΠΉ ΠΈ ΠΏΠΎΠ΄Π²ΠΎΠ΄Π½ΠΎΠΉ ΠΌΠ΅ΡΠ·Π»ΠΎΡΡ Π½Π° ΠΠΎΡΡΠΎΡΠ½ΠΎ-Π‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠΌ ΡΠ΅Π»ΡΡΠ΅ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ Π²ΠΎΠ²Π»Π΅ΡΠ΅Π½ΠΈΡ Π² ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΉ Π±ΠΈΠΎΠ³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠΉ ΡΠΈΠΊΠ» Π±ΠΎΠ»ΡΡΠΎΠ³ΠΎ ΠΎΠ±ΡΠ΅ΠΌΠ° ΡΠ΅ΠΌΠΎΠ±ΠΈΠ»ΠΈΠ·ΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ³Π»Π΅ΡΠΎΠ΄Π°. ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ Π΅Π³ΠΎ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ° ΠΈ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΠΈΡΡΠ΅ΠΌΠ΅ ΡΡΡΠ°-ΡΠ΅Π»ΡΡ ΠΈΠ³ΡΠ°Π΅Ρ Π²Π°ΠΆΠ½ΡΡ ΡΠΎΠ»Ρ Π΄Π»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊΡΠ°ΠΉΠ½Π΅ Ρ
ΡΡΠΏΠΊΠΎΠΉ Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΠΎΡΠΈΡΡΠ΅ΠΌΡ. Π¦Π΅Π»Ρ: ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ Π³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π°, ΠΏΡΠΎΡΠ»Π΅ΠΆΠΈΠ²Π°Π΅ΠΌΡΡ
ΠΏΠΎ ΠΏΡΠΎΡΠΈΠ»Ρ ΠΎΡ Π±Π΅ΡΠ΅Π³ΠΎΠ²ΠΎΠΉ Π·ΠΎΠ½Ρ ΠΊ ΠΊΠΎΠ½ΡΠΈΠ½Π΅Π½ΡΠ°Π»ΡΠ½ΠΎΠΌΡ ΡΠΊΠ»ΠΎΠ½Ρ ΠΌΠΎΡΡ ΠΠ°ΠΏΡΠ΅Π²ΡΡ
Ρ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ ΠΌΠ΅ΡΠΎΠ΄Π° Rock-Eval ΠΈ ΠΎΡΠ΅Π½ΠΊΠ° ΠΈΡ
Π²Π·Π°ΠΈΠΌΠΎΡΠ²ΡΠ·ΠΈ Ρ Π»ΠΈΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΡΠ²ΠΎΠΉΡΡΠ²Π°ΠΌΠΈ Π²ΠΌΠ΅ΡΠ°ΡΡΠΈΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ². ΠΠ±ΡΠ΅ΠΊΡΠΎΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΡΠ²ΠΈΠ»ΠΈΡΡ ΠΏΡΠΎΠ±Ρ Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ², Π²Π·ΡΡΡΠ΅ Ρ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΠΎΠ³ΠΎ Π³ΠΎΡΠΈΠ·ΠΎΠ½ΡΠ° (0-2 ΡΠΌ). ΠΡΠ±ΠΎΡ ΠΏΡΠΎΠ± ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΡΡ Π² ΠΌΠΎΡΡΠΊΠΈΡ
Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΊΡΠΏΠ΅Π΄ΠΈΡΠΈΡΡ
2018-2019 Π³Π³. Π½Π° ΠΠΠ‘ Β«ΠΠΊΠ°Π΄Π΅ΠΌΠΈΠΊ ΠΡΡΠΈΡΠ»Π°Π² ΠΠ΅Π»Π΄ΡΡΒ». Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠ° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² ΠΏΠΈΡΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° Π΄Π°Π½Π° Π³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠ°Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠ° ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π°, ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠ΅Π³ΠΎΡΡ Π² Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠ°Ρ
ΠΌΠΎΡΡ ΠΠ°ΠΏΡΠ΅Π²ΡΡ
. ΠΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ΅ Π²Π΅ΡΠ΅ΡΡΠ²ΠΎ, ΡΠΊΡΠΏΠΎΡΡΠΈΡΡΠ΅ΠΌΠΎΠ΅ Ρ ΡΠ΅ΡΠ½ΡΠΌ ΡΡΠΎΠΊΠΎΠΌ ΠΈ ΠΏΡΠΎΠ΄ΡΠΊΡΠ°ΠΌΠΈ Π±Π΅ΡΠ΅Π³ΠΎΠ²ΠΎΠΉ ΡΡΠΎΠ·ΠΈΠΈ, Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΠ΅ΡΡΡ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π½ΠΈΠ·ΠΊΠΈΠΌ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π½ΡΠΌ (OI) ΠΈ Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Π½ΡΠΌ (HI) ΠΈΠ½Π΄Π΅ΠΊΡΠ°ΠΌΠΈ Π² ΠΏΡΠΈΠ±ΡΠ΅ΠΆΠ½ΠΎΠΉ Π·ΠΎΠ½Π΅ ΠΈ Π½Π° Π³Π»ΡΠ±ΠΈΠ½Π°Ρ
Π΄ΠΎ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΈΡ
Π΄Π΅ΡΡΡΠΊΠΎΠ² ΠΌΠ΅ΡΡΠΎΠ². Π ΡΠ°ΠΉΠΎΠ½Π΅ ΡΡΠ΅Π΄Π½Π΅Π³ΠΎ ΡΠ΅Π»ΡΡΠ° ΡΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ΅ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π½Π° ΡΠΎΡΡΠ°Π² ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π°, ΠΏΠΎ Π²ΡΠ΅ΠΉ Π²ΠΈΠ΄ΠΈΠΌΠΎΡΡΠΈ, ΠΎΠΊΠ°Π·ΡΠ²Π°Π΅Ρ ΡΠ½ΠΎΡ ΠΎΡΠ°Π΄ΠΎΡΠ½ΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Ρ ΠΠΎΠ²ΠΎΡΠΈΠ±ΠΈΡΡΠΊΠΈΡ
ΠΎΡΡΡΠΎΠ²ΠΎΠ², Π³Π΄Π΅ Π°ΠΊΡΠΈΠ²Π½ΠΎ Π΄Π΅ΠΉΡΡΠ²ΡΡΡ ΡΠ΅ΡΠΌΠΎΠ°Π±ΡΠ°Π·ΠΈΠΎΠ½Π½ΡΠ΅ ΠΏΡΠΎΡΠ΅ΡΡΡ (ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠΉ HI ΠΈ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ OI). ΠΡΡΠΊΠ°Π·Π°Π½ΠΎ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅, ΡΡΠΎ Π΄Π»Ρ ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ², Π²ΡΠ½ΠΎΡΠΈΠΌΡΡ
ΡΠ΅ΡΠ½ΡΠΌ ΡΡΠΎΠΊΠΎΠΌ, ΠΈ ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ² ΡΡΠΎΠ·ΠΈΠΈ Π±Π΅ΡΠ΅Π³ΠΎΠ² Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠ½Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ ΠΏΠΈΡΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ, ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΠΌΡΠ΅ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Rock-Eval (Π² ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ, Π·Π½Π°ΡΠ΅Π½ΠΈΡ HI, OI ΠΈ Tpeak).An increasing rate of degradation of coastal and subsea permafrost leads to remobilization of huge amounts of organic carbon. To know how this remobilized carbon behaves while being transported through the land-shelf system is crucially important for understanding an extremely fragile Arctic ecosystem. This study is aimed at tracing the geochemical signals of organic matter along the profile from the coastal zone to the continental slope of the Laptev Sea, using the Rock-Eval approach. We investigated surface sediment samples obtained during the Arctic marine expeditions of 2018-2019 on the R/V "Akademik Mstislav Keldysh". The most active oxidation of organic matter, exported with river runoff and products of coastal erosion, occurs in the coastal zone at a depth of several tens of meters. A significant effect on the organic matter composition is exerted by the sediment export from Novosibirsk Islands eroding coastlines. We assume that various products carried by river runoff and coastal erosion are characterized by various signatures detected by the Rock-Eval method (e.g., the OI and Tpeak values). It is also shown that the mineral matrix does not seem to provide a first-order control on preventing organic matter degradation during transport from the coastal zone to deep-sea basins
Composition of organic matter in bottom sediments of the Chaunskaya Bay (East Siberian Sea)
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡΡ ΠΎΡΠ΅Π½ΠΊΠΈ ΡΠ΅Π³ΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ° ΠΈ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π² ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠ΅Π΄ΠΈΠΌΠ΅Π½ΡΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΈ Π±ΠΈΠΎΠ³Π΅ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΠ±ΡΡΠ°Π½ΠΎΠ²ΠΊΠ°Ρ
, Π΄Π΅ΠΉΡΡΠ²ΡΡΡΠΈΡ
Π½Π° ΠΠΎΡΡΠΎΡΠ½ΠΎΠ‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠΌ Π°ΡΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΌ ΡΠ΅Π»ΡΡΠ΅, Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ Π² ΠΠΎΡΡΠΎΡΠ½ΠΎ-Π‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠΌ ΠΌΠΎΡΠ΅ - Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π»Π΅Π΄ΠΎΠ²ΠΈΡΠΎΠΌ ΠΈ Π½Π°ΠΈΠΌΠ΅Π½Π΅Π΅ ΠΈΠ·ΡΡΠ΅Π½Π½ΠΎΠΌ ΠΌΠΎΡΠ΅ Π ΠΎΡΡΠΈΠΉΡΠΊΠΎΠΉ ΠΡΠΊΡΠΈΠΊΠΈ. Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π·Π°ΠΊΠ»ΡΡΠ°Π΅ΡΡΡ Π² ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠΈ ΡΠΎΡΡΠ°Π²Π° ΠΈ ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ² Π§Π°ΡΠ½ΡΠΊΠΎΠΉ Π³ΡΠ±Ρ (ΠΠΎΡΡΠΎΡΠ½ΠΎ-Π‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠ΅ ΠΌΠΎΡΠ΅). ΠΠ±ΡΠ΅ΠΊΡΡ: 25 ΠΏΡΠΎΠ± ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΡΡ
Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ², ΠΎΡΠΎΠ±ΡΠ°Π½Π½ΡΡ
ΠΏΠΎ ΠΏΡΠΎΡΠΈΠ»Ρ ΠΎΡ ΠΏΡΠΈΠ±ΡΠ΅ΠΆΠ½ΠΎΠΉ Π·ΠΎΠ½Ρ Π§Π°ΡΠ½ΡΠΊΠΎΠΉ Π³ΡΠ±Ρ Π΄ΠΎ Π²Π½ΡΡΡΠ΅Π½Π½Π΅ΠΉ ΡΠ°ΡΡΠΈ ΡΠ΅Π»ΡΡΠ° ΠΠΎΡΡΠΎΡΠ½ΠΎ-Π‘ΠΈΠ±ΠΈΡΡΠΊΠΎΠ³ΠΎ ΠΌΠΎΡΡ Π² Ρ
ΠΎΠ΄Π΅ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΠΎΠΉ Π½Π°ΡΡΠ½ΠΎ-ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΡΠΊΠΎΠΉ ΠΌΠΎΡΡΠΊΠΎΠΉ ΡΠΊΡΠΏΠ΅Π΄ΠΈΡΠΈΠΈ Π½Π° Π±ΠΎΡΡΡ ΠΠΠ‘ Β«ΠΠΊΠ°Π΄Π΅ΠΌΠΈΠΊ ΠΠΏΠ°ΡΠΈΠ½Β» Π² ΡΠ΅Π½ΡΡΠ±ΡΠ΅-ΠΎΠΊΡΡΠ±ΡΠ΅ 2020 Π³. ΠΠ΅ΡΠΎΠ΄Ρ. ΠΠ»Ρ Π°Π½Π°Π»ΠΈΠ·Π° Π³ΡΡΠΏΠΏ ΡΠ³Π»Π΅Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Π½ΡΡ
ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠΉ ΠΠ Π΄ΠΎΠ½Π½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ² Π±ΡΠ» ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ ΠΏΠΈΡΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΏΠΎ ΠΌΠ΅ΡΠΎΠ΄Ρ Rock-Eval; ΠΎΡΠ΅Π½ΠΊΠ° ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π½-Π°Π»ΠΊΠ°Π½ΠΎΠ² ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»Π°ΡΡ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠΎΠ² Π³Π°Π·ΠΎΠ²ΠΎΠΉ Ρ
ΡΠΎΠΌΠ°ΡΠΎ-ΠΌΠ°ΡΡ-ΡΠΏΠ΅ΠΊΡΡΠΎΠΌΠ΅ΡΡΠΈΠΈ. ΠΡΠ°Π½ΡΠ»ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΎΡΠ°Π΄ΠΊΠΎΠ² Π²ΡΠΏΠΎΠ»Π½ΡΠ»ΡΡ Π½Π° Π»Π°Π·Π΅ΡΠ½ΠΎΠΌ Π°Π½Π°Π»ΠΈΠ·Π°ΡΠΎΡΠ΅ ΡΠ°ΡΡΠΈΡ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π‘ΠΎΡΡΠ°Π² ΠΎΡΠ°Π΄ΠΎΡΠ½ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° Π² Π§Π°ΡΠ½ΡΠΊΠΎΠΉ Π³ΡΠ±Π΅ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΡΠΌΠΈ ΠΏΠΎΠ΄Π²ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΡΠ΅Π»ΡΠ΅ΡΠ° ΠΈ Π³ΡΠ°Π²ΠΈΡΠ°ΡΠΈΠΎΠ½Π½ΡΠΌΠΈ ΠΏΠΎΡΠΎΠΊΠ°ΠΌΠΈ ΠΏΠΎΡΡΡΠΏΠ°ΡΡΠ΅Π³ΠΎ ΡΠ΅ΡΡΠΈΠ³Π΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π° - ΠΏΡΠΎΠ΄ΡΠΊΡΠΎΠ² Π»ΠΎΠΊΠ°Π»ΡΠ½ΠΎΠΉ ΡΠ΅ΡΠΌΠΎΠ°Π±ΡΠ°Π·ΠΈΠΈ Π±Π΅ΡΠ΅Π³ΠΎΠ²ΠΎΠΉ Π·ΠΎΠ½Ρ (ΠΎ. ΠΠΉΠΎΠ½) ΠΈ ΡΠ΅ΡΠ½ΠΎΠ³ΠΎ Π°Π»Π»ΡΠ²ΠΈΡ Π² ΡΠ³ΠΎ-Π²ΠΎΡΡΠΎΡΠ½ΠΎΠΉ ΡΠ°ΡΡΠΈ Π³ΡΠ±Ρ. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΡΡ ΡΠΎΠ»Ρ Π² ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΠ΅Π΄ΠΈΠΌΠ΅Π½ΡΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΎΠ±Π»ΠΈΠΊΠ° Π³ΡΠ±Ρ, ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΠΎ, ΠΈΠ³ΡΠ°ΡΡ ΠΏΡΠΎΡΠ΅ΡΡΡ Π²ΡΡΠ°ΠΈΠ²Π°Π½ΠΈΡ ΠΊΡΠΈΠΎΠ·ΠΎΠ»Ρ Π² ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ΅ ΡΠ°Π·ΡΡΡΠ΅Π½ΠΈΡ ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ ΠΏΡΠΈΠΏΠ°ΠΉΠ½ΠΎΠ³ΠΎ Π»ΡΠ΄Π°. ΠΠ°Π½Π½ΡΠ΅ ΠΏΠΈΡΠΎΠ»ΠΈΠ·Π° ΠΈ Π°Π½Π°Π»ΠΈΠ· ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π½-Π°Π»ΠΊΠ°Π½ΠΎΠ² Π΄Π»Ρ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠΎΠ² ΡΠΊΠ°Π·ΡΠ²Π°ΡΡ Π½Π° ΡΠΌΠ΅ΡΠ°Π½Π½ΡΠΉ Π³Π΅Π½Π΅Π·ΠΈΡ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π² ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ½ΡΡ
ΠΎΡΠ°Π΄ΠΊΠ°Ρ
Ρ Π΄ΠΎΠΌΠΈΠ½ΠΈΡΡΡΡΠΈΠΌ Π²ΠΊΠ»Π°Π΄ΠΎΠΌ Π½Π°Π·Π΅ΠΌΠ½ΠΎΠ³ΠΎ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° Π²ΡΡΠΎΠΊΠΎΠΉ ΡΡΠ΅ΠΏΠ΅Π½ΠΈ ΠΏΡΠ΅ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΠΎΡΡΠΈ ΠΈ Π²ΡΡΠΎΠΊΠΎΠ΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ ΡΡΡΠ΄Π½ΠΎΡΠ°Π·Π»Π°Π³Π°Π΅ΠΌΡΡ
Π³ΡΠΌΠΈΠ½ΠΎΠ²ΡΡ
Π²Π΅ΡΠ΅ΡΡΠ² ΠΈ ΡΡΠ»ΡΠ²ΠΎΠΊΠΈΡΠ»ΠΎΡ. ΠΡΠΈΡΡΡΡΡΠ²ΠΈΠ΅ Π°Π²ΡΠΎΡ
ΡΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π° ΠΎΡΡΠ°ΠΆΠ°Π΅Ρ Π²ΡΡΠΎΠΊΡΡ ΠΏΡΠΎΠ΄ΡΠΊΡΠΈΠ²Π½ΠΎΡΡΡ Π²ΠΎΠ΄ Π§Π°ΡΠ½ΡΠΊΠΎΠΉ Π³ΡΠ±Ρ.The relevance of the study is determined by the need to assess the regional characteristics of transport and transformation of organic matter in various sedimentation and biogeochemical environments on the East Siberian Arctic Shelf, in particular in the less studied and remoted East Siberian Sea. The main aim of the study is to determine the composition and sources of organic matter of bottom sediments of the Chaunskaya Bay (East Siberian Sea). Objects: 25 surface bottom sediments sampled along the transect from the coastal zone of the Chaunskaya Bay to the inner part of the East Siberian Sea shelf during the marine expedition on the R/V Β«Academician OparinΒ» in September-October 2020. Methods. Rock-Eval pyrolytic analysis was used to analyze groups of hydrocarbon compounds in organic matter from bottom sediments; the n-alkanes distribution was estimated based on the results of gas chromatography-mass-spectrometry. Grain size analysis was performed on a laser particle analyzer. Results. The composition of sedimentary material in the Chaunskaya Bay is mainly determined by the features of the underwater relief and gravity flows of the incoming terrigenous material - products of local thermal abrasion of the coastal zone (Ayon Island) and river alluvium in the southeastern part of the bay. A certain role in the formation of the sedimentary appearance of the bay is presumably played by the processes of cryosol thawing as a result of the destruction of fast ice areas. Pyrolysis data and analysis of the distribution of n-alkanes for surface sediments indicate a mixed genesis of organic matter in surface sediments with a dominant contribution of terrestrial organic matter of a high degree of transformation and a high content of hardly decomposable humic substances and fulvic acids. The presence of autochthonous organic matter reflects the high productivity of the Chaunskaya Bay waters